The baby name Alethea appears in baby name data for the United States from 1933 to 2024. It was most popular in 1973 with 291 babies given the name.
Over the period shown, Alethea has stayed at a similar level of popularity.
| Year | Count |
|---|---|
| 1933 | 7 |
| 1950 | 7 |
| 1951 | 10 |
| 1954 | 5 |
| 1955 | 25 |
| 1956 | 5 |
| 1957 | 15 |
| 1958 | 12 |
| 1959 | 19 |
| 1960 | 53 |
| 1961 | 38 |
| 1962 | 28 |
| 1963 | 52 |
| 1964 | 23 |
| 1965 | 17 |
| 1967 | 20 |
| 1968 | 50 |
| 1969 | 34 |
| 1970 | 28 |
| 1971 | 60 |
| 1972 | 29 |
| 1973 | 291 |
| 1974 | 136 |
| 1975 | 47 |
| 1976 | 63 |
| 1977 | 27 |
| 1978 | 20 |
| 1979 | 16 |
| 1980 | 31 |
| 1981 | 29 |
| 1982 | 27 |
| 1983 | 10 |
| 1987 | 25 |
| 1988 | 15 |
| 1989 | 7 |
| 1991 | 5 |
| 2001 | 5 |
| 2014 | 5 |
| 2017 | 10 |
| 2020 | 13 |
| 2022 | 21 |
| 2023 | 18 |
| 2024 | 27 |